Figure 5

Spectrograms when there are airway problems and when they are resolved. (A) Spectrogram when vibrant breathing sounds were heard. Many multiple vertical lines are exhibited for one second. (B) Spectrogram 10 min after suction. The length of the vertical line appeared to have decreased. The duration of respiration was also decreased from over one second to under one second. (C) Spectrogram when sharp breathing sounds were heard. Multiple horizontal lines exhibited over 2000 Hz. Some acoustic energy was shown above 10,000 Hz. (D) Spectrogram after 5 min after tube change and suction. Acoustic energy above 2000 Hz disappeared. Only acoustic energy under 2000 Hz was exhibited during respiration.